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mp3dec: Check for memcpy size to be positive.

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No, ive no testcase.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-26 03:30:46 +01:00
parent 10e9d1f76b
commit 46095f427e
1 changed files with 2 additions and 1 deletions
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3
libavcodec/mpegaudiodec.c
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@ -1385,7 +1385,8 @@ static int mp_decode_layer3(MPADecodeContext *s)
av_dlog(s->avctx, "seekback: %d\n", main_data_begin);
//av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
memcpy(s->last_buf + s->last_buf_size, ptr,
if (s->gb.size_in_bits > get_bits_count(&s->gb))
memcpy(s->last_buf + s->last_buf_size, ptr,
FFMIN(EXTRABYTES, (s->gb.size_in_bits - get_bits_count(&s->gb))>>3));
s->in_gb = s->gb;
init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);